Titans' head coach Jeff Fisher has called the non-call on a delay of game penalty against the Ravens on Saturday night 'unacceptable'. "I've always maintained that there's a human element in the game as far as officiating is concerned. [They're] going to make mistakes; it is part of our game," Fisher said, according to The Tennessean. "But this particular mistake was unacceptable. There is no excuse for it, it was a mistake, and it was a costly mistake. "It was not the reason we lost the game, but it was a mistake, an error."